A gigantically increased ratio of electrical to thermal conductivity and synergistically enhanced thermoelectric properties in interface-controlled TiO2-RGO nanocomposites

Woo Hyun Nam, Young Soo Lim, Woochul Kim, Hyeon Kook Seo, Kyun Seong Dae, Soonil Lee, Won Seon Seo, Jeong Yong Lee

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We report synergistically enhanced thermoelectric properties through the independently controlled charge and thermal transport properties in a TiO2-reduced graphene oxide (RGO) nanocomposite. By the consolidation of TiO2-RGO hybrid powder using spark plasma sintering, we prepared an interface-controlled TiO2-RGO nanocomposite where its grain boundaries are covered with the RGO network. Both the enhancement in electrical conductivity and the reduction in thermal conductivity were simultaneously achieved thanks to the beneficial effects of the RGO network, and detailed mechanisms are discussed. This led to the gigantic increase in the ratio of electrical to thermal conductivity by six orders of magnitude and also the synergistic enhancement in the thermoelectric figure of merit by two orders. Our results present a strategy for the realization of 'phonon-glass electron-crystals' through interface control using graphene in graphene hybrid thermoelectric materials.

Original languageEnglish
Pages (from-to)7830-7838
Number of pages9
JournalNanoscale
Volume9
Issue number23
DOIs
Publication statusPublished - 2017 Jun 21

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Oxides
Graphene
Thermal conductivity
Nanocomposites
Spark plasma sintering
Consolidation
Powders
Transport properties
Grain boundaries
Glass
Crystals
Electrons

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Nam, Woo Hyun ; Lim, Young Soo ; Kim, Woochul ; Seo, Hyeon Kook ; Dae, Kyun Seong ; Lee, Soonil ; Seo, Won Seon ; Lee, Jeong Yong. / A gigantically increased ratio of electrical to thermal conductivity and synergistically enhanced thermoelectric properties in interface-controlled TiO2-RGO nanocomposites. In: Nanoscale. 2017 ; Vol. 9, No. 23. pp. 7830-7838.
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A gigantically increased ratio of electrical to thermal conductivity and synergistically enhanced thermoelectric properties in interface-controlled TiO2-RGO nanocomposites. / Nam, Woo Hyun; Lim, Young Soo; Kim, Woochul; Seo, Hyeon Kook; Dae, Kyun Seong; Lee, Soonil; Seo, Won Seon; Lee, Jeong Yong.

In: Nanoscale, Vol. 9, No. 23, 21.06.2017, p. 7830-7838.

Research output: Contribution to journalArticle

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